Daily LATE BLIGHT Forecast Information From BLITECAST: Northeastern PA, 2007
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For Tomatoes and Potatoes ##############################################
========================= # * = Standard sites through Sep 23 #
# ** = EXPERIMENTAL SITES through Sep 23 #
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How favorable is daily weather for LATE BLIGHT development? Values presented
in calendar format indicate favorability of weather for LATE BLIGHT development.
Key: 0-4 = Conditions not very favorable for LATE BLIGHT (0 = least favorable).
5-28 = Conditions favorable enough to warrant fungicide (28 = most favorable).
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LATE Standard Site * EXPERIMENTAL SITE ** Standard Site *
BLIGHT Northumb: Montandon Luzerne: Forty Fort Lackawanna: Cl.Summit
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Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa Su Mo Tu We Th Fr Sa
== == == == == == == == == == == == == == == == == == == == ==
June ==================== ==================== ====================
01-02: 6e 8e 0 0 4 4
03-09: 6e 8e10H11#10#10# 7# 0 3 3 3 3 4 4 5e 7e11e11e11e10e10e
10-16: 6# 3 1 2 1 1 1 4 1 1 1R 1 1 1 8e 5e 1 3 3 3 2
17-23: 1 1 1 1 1 1 1 1 1 1 2 2 2 2R 4H 5# 5# 4 4 4 4
24-30: 2 2 3 2 3 4R 4 2 2 3 2 3 4 4 2 1 2 1 3 6# 6#
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July ==================== ==================== ====================
01-07: 4 4 3 3 4 3 4 4 4 3 3 4 3 4 6# 6# 5# 5# 7# 6# 8#
08-14: 4 4 4 4 2 1 1 4 4 4 4 2 1 1 9# 9# 9#10# 8# 6# 4
15-21: 1 1 0 0 0 0 0 1 1 0 0 0 0 0 3 3 3 2 2 5# 5#
22-28: 0 0 0 0 0 0 2 1 1 1 1 1 1 2 5# 5# 9#11#10# 8#12#
29-31: 3 5# 5# 3 4 4 14#17#13#
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August ==================== ==================== ====================
01-04: 5# 5# 6# 4 4 4 4 3 13#13#12# 9#
05-11: 3 3 3 4 4 6# 6# 2 1 2 2 2 4 4 6# 4 7# 9# 9#11#14#
12-18: 6# 4 4 3 3 1 1 4 4 3 3 3 1 1 16#15#12# 9# 9# 8# 4
19-25: 1 0 4 8#11#14#16# 1 2 6#10#12#12#15# 3 3 7#11#14#17#19#
26-31: 16#15#11# 8# 7# 5# 15#15#11# 7# 4 3 21#22#20#18#16#15#
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Sept. ==================== ==================== ====================
01: 4 1 13#
02-08: 3 2 2 1 0 0 0 0 0 0 0 0 0 0 11# 9# 7# 5# 5# 4 5#
09-15: 1 2 3 5# 5# 5# 6# 0 0 2 3 3 3 4 7# 8#12#12#10#10#11#
16-22: 5# 4 3 1 1 1 1 4 4 2 1 1 1 1 9# 8# 4 5# 5# 3 1
23-29: 0 - - - - - - 0 - - - - - - 0 - - - - - -
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Key: # = BLITECAST indicates late blight protection most important these days.
Values based on measured Temperature, Relative Humidity, Wetness, & Rain.
e = early = BLITECAST indicates that recent weather was favorable for late
blight development but the initial thresholds (CS18; 10BFD) were not
reached yet.
R = Rain+Temperature based threshold (10BFD) = 10 Consecutive Blight
Favorable Days. If inoculum is present, symptoms are expected in
about 7-14 days.
H = Humidity+Temperature based threshold (CS18) = 18 Cumulative Severity
Values for the season. If inoculum is present, symptoms are expected
in about 7-14 days.
* STANDARD SITE: Disease forecast developed from quality on-site
calibrated environmental measurements.
** EXPERIMENTAL SITE: Disease forecast developed from experimental data;
calibration is in progress. Forecast is for experimental use only.
Compare results for Experimental sites with results from nearby
Standard sites before considering information from an Experimental site.
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developed by Dr. Alan A. MacNab, Professor, Plant Pathology
Penn State College of Agricultural Sciences
211 Buckhout Lab, University Park, PA 16802
Updated: Sep 24, 2007; EMH
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Where trade names are used, no discrimination is intended
and no endorsement by the Cooperative Extension Service is implied.
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